对压铸AlMgxSi2Mn(x=5.7~7.2)合金的微观组织进行分析,测试力学性能以及疲劳性能,研究镁含量对合金组织和力学性能的影响.结果表明:随着Mg含量的提高,合金屈服强度和布氏硬度分别提高了10.4%和9%,伸长率从8.3%降低至4.5%,抗拉强度则没有明显变化.疲劳寿命随着Mg含量的提高而提高,疲劳极限从57 MPa上升至75 MPa.合金的微观组织主要由α(Al)和 Mg2Si 相组成,Fe 相则以颗粒状的 Al3Fe 和不规则形状的Al15(Fe,Mn)3Si2存在于晶界.Mn元素的加入也降低合金的粘模倾向.
@@@@Microstructure observation, tensile test and fatigue tests were conducted to investigate the effect of magnesium content on microstructure and mechanical properties of die casting AlMgxSi2Mn (x=5.7?7.2) alloys. The results indicate that with magnesium content (mass fraction) increasing from 5.7% to 7.2%, the yield strength and brinell hardness increase by 10.4%and 9%, respectively. The elongation decreases from 8.3%to 4.5%and the ultimate tensile strength is stable. The fatigue life of alloys increases with enhanced magnesium contents and the fatigue limit increases from 57MPa to 75MPa. The microstructure of those alloys consists ofα(Al) matrix and Mg2Si. Meanwhile, Al3Fe and Al15(Fe,Mn)3Si2 compounds distribute around grain boundaries. The addition of Mn reduces the die sticking tendency.
参考文献
| [1] | Alan A.Luo,Anil K.Sachdev,Bob R.Powell.Advanced casting technologies for lightweight automotive applications[J].中国铸造,2010(04):463-469. |
| [2] | YUAN Xiao-guang,HUANG Hong-jun,LI Rong-de,CAO Yang,SU Shi-fang.Die Casting Technology Develops Steadily——A Commentary on the 5th China International Die Casting Congress[J].中国铸造,2006(04):322-324. |
| [3] | 万里,刘后尧,吴树森,吴湛方,赖沛基,张遇朝,张新强.轿车底盘铝合金后副车架的压铸技术开发[J].特种铸造及有色合金,2012(02):145-148. |
| [4] | GB/T15115-2009.压铸铝合金[S]. |
| [5] | 郭洪民,杨湘杰.流变压铸YL112铝合金的热处理与力学性能[J].中国有色金属学报,2008(03):394-399. |
| [6] | Ammar HR;Samuel AM;Samuel FH .Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al-Si casting alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):65-75. |
| [7] | Ammar HR;Samuel AM;Samuel FH .Effects of surface porosity on the fatigue strength of AE425 and PM390 hypereutectic Al-Si casting alloys at medium and elevated temperatures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):58-64. |
| [8] | H. R. Ammar;A. M. Samuel;F. H. Samuel .Porosity and the fatigue behavior of hypoeutectic and hypereutectic aluminum-silicon casting alloys[J].International Journal of Fatigue,2008(6):1024-1035. |
| [9] | 饶劲松,李华基,王翠玲,薛寒松.压铸铝合金ADC12.1R的组织、性能及成形性[J].重庆大学学报（自然科学版）,2005(10):24-26,35. |
| [10] | Okayasu, M.;Ohkura, Y.;Takeuchi, S.;Takasu, S.;Ohfuji, H.;Shiraishi, T..A study of the mechanical properties of an Al-Si-Cu alloy (ADC12) produced by various casting processes[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:185-192. |
| [11] | OTARAWANNA S;GOURLAY C M;LAUKLI H I .Microstructure formation in AlSi4MgMn and AlMg5Si2Mn high-pressure die castings[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2009,40(07):1645-1659. |
| [12] | HAN S;KUMAI S;SATO A .Fatigue crack growth behavior in semi-liquid die-cast Al-7%Si-0.4%Mg alloys with fine effective grain structure[J].Materials Science and Engineering A,2001,308(1/2):225-232. |
| [13] | Lorella Ceschini;Iuri Boromei;Alessandro Morri;Salem Seifeddine;Ingvar L. Svensson .Microstructure, tensile and fatigue properties of the Al-10%Si-2%Cu alloy with different Fe and Mn content cast under controlled conditions[J].Journal of Materials Processing Technology,2009(15/16):5669-5679. |
| [14] | BELOV N A;ESKIN D G;AKSENOV A A.Multicomponent phase diagrams:Application for commercial aluminum alloys[M].Oxford:Elsevier,2005:47-82. |
| [15] | 丁惠麟.实用铝、铜及其合金金相热处理和失效分析[M].北京:机械工业出版社,2007:104-110. |
| [16] | N.C.W. Kuijpers;F.J. Vermolen;C. Vuik;P.T.G. Koenis;K.E. Nilsen;S. van der Zwaag .The dependence of the β-AlFeSi to α-Al(FeMn)Si transformation kinetics in Al-Mg-Si alloys on the alloying elements[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):9-19. |
| [17] | B85/B85M-10..ASTM standard:Standard specification for aluminum-alloy die castings[S]. |
| [18] | 程晓宇,熊守美,CHOU Hsin-nan.压铸A380合金力学性能及热处理工艺性能研究[J].铸造,2012(02):152-155. |
| [19] | SURESH S.Fatigue of structures and materials[M].New York:Cambridge University Press,1991:67-70. |
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